Unsteady in-plane vortex motion in a microchannel liquid flow

Lap Man Lee, Winky Lap Wing Hau, Yi Kuen Lee, Man Wong, Yitshak Zohar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

An unsteady flow can dramatically enhance the mixing efficiency in a highly localized region, as the flow would become chaotic if time is an independent variable. In this work, the response of uniform electroosmotic flow to an oscillating electric field is first examined experimentally and numerically as a function of the driving frequency. Then a steady in-plane micro vortex flow pattern, traced by microparticles, is realized and compared to numerical simulations. Upon confirmation of the simulations for uniform but unsteady and steady but non-uniform flows, the CFD code has finally been applied to study unsteady non-uniform flow field, for which it is difficult to measure flow properties. The time evolution of liquid vortex motion in a microchannel, due to either sinusoidal or sudden electric field reversal, is numerically investigated revealing the relationship between length and time scales dominating momentum transfer in electrokinetically-driven unsteady liquid flow.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)
Pages734-737
Number of pages4
DOIs
StatePublished - 2005
Event18th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2005 Miami - Miami Beach, FL, United States
Duration: Jan 30 2005Feb 3 2005

Other

Other18th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2005 Miami
CountryUnited States
CityMiami Beach, FL
Period1/30/052/3/05

Fingerprint

Microchannels
Vortex flow
Electric fields
Momentum transfer
Liquids
Unsteady flow
Flow patterns
Flow fields
Computational fluid dynamics
Computer simulation

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Control and Systems Engineering

Cite this

Lee, L. M., Hau, W. L. W., Lee, Y. K., Wong, M., & Zohar, Y. (2005). Unsteady in-plane vortex motion in a microchannel liquid flow. In Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS) (pp. 734-737). [WP19] https://doi.org/10.1109/MEMSYS.2005.1454034

Unsteady in-plane vortex motion in a microchannel liquid flow. / Lee, Lap Man; Hau, Winky Lap Wing; Lee, Yi Kuen; Wong, Man; Zohar, Yitshak.

Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS). 2005. p. 734-737 WP19.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Lee, LM, Hau, WLW, Lee, YK, Wong, M & Zohar, Y 2005, Unsteady in-plane vortex motion in a microchannel liquid flow. in Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS)., WP19, pp. 734-737, 18th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2005 Miami, Miami Beach, FL, United States, 1/30/05. https://doi.org/10.1109/MEMSYS.2005.1454034
Lee LM, Hau WLW, Lee YK, Wong M, Zohar Y. Unsteady in-plane vortex motion in a microchannel liquid flow. In Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS). 2005. p. 734-737. WP19 https://doi.org/10.1109/MEMSYS.2005.1454034
Lee, Lap Man ; Hau, Winky Lap Wing ; Lee, Yi Kuen ; Wong, Man ; Zohar, Yitshak. / Unsteady in-plane vortex motion in a microchannel liquid flow. Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS). 2005. pp. 734-737
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